C++ bool returns 0 1 instead of true false

问题:

I have overloaded equals (including == and !=) that checks if two objects are equals and then returns a boolean.

Unfortunately, it prints 0 or 1. I know it's correct but I can't figure out the way to make it to print true or false for readability purposes.

I've even tried:

if (a.equals(b))
{
    return true;
}

return false;

However, C++ is stubborn enough to output 0 or 1.

Any help would be appreciated.

Edit - Print is done:

cout << "a == b is " << (a == b) << endl;

Desired output is

a == b is true

回答1:

You can use std::boolalpha:

Sets the boolalpha format flag for the str stream.

When the boolalpha format flag is set, bool values are inserted/extracted as their names: true and false instead of integral values.

This flag can be unset with the noboolalpha manipulator.

The boolalpha flag is not set in standard streams on initialization.

std::cout.setf(std::ios::boolalpha);
std::cout << true;

or

std::cout << std::boolalpha << true;

回答2:

You need to use std::boolalpha:

cout << boolalpha << yourthing() << endl;

回答3:

You need to use std::boolalpha to print true/false :

#include <iostream>

int main()
{
  std::cout << std::boolalpha << true << std::endl;
}

回答4:

If you need to do this outside of a stream output <<, it's a simple ternary expression:

std::string str = (a == b) ? "true" : "false";